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Ultra-high responsivity (>12.34 kA/W) of ga-in bimetallic oxide nanowires based deep-UV photodetector
摘要： This work demonstrates the application of bimetallic oxide nanowires (NWs) for deep UV-photodetectors. The Ga-In based NWs has been fabricated by low cost and scalable electrospinning method. The fabrication process includes the synthesis of NWs on cleaned quartz substrate using electrospinning and followed by Al (100 nm)/Au (20 nm)-electrode deposition on top of the fine sheet of NWs. Owing to the very large surface to volume ratio, high porosity, photon trapping, and simultaneous front and back illumination, the fabricated bimetallic photodetector has shown a record ultra-high responsivity and the photo-dark current ratio of ~12348 AW-1 and ~298846 at 1 V bias respectively. The device has further revealed high detectivity ~3.27 × 1015 mHz0.5W-1 and external quantum efficiency ~7.73 × 106 %.
关键词： GaInO3,nanowires,bimetallic,ultra-high responsivity,UV-photodetector,electrospinning
更新于2025-09-19 17:13:59
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Ultrafast, sensitive and visual sensing of copper ions by a dual-fluorescent film based on quantum dots
摘要： The use of fluorescent sensors is one of the most promising approaches for meeting the growing demand for a sensitive, convenient and cost-effective detection method of metal ions. However, visual sensing based on fluorescent materials remains a challenge due to the hard-to-see changes in fluorescence intensity, long response time and poor stability. Here, a simple and effective film sensor was developed for the visual detection of Cu2+ using quantum dots (QDs) modified by polyethylenimine (PEI) and poly(vinylidene fluoride) (PVDF) by electrospinning and dip-coating methods. QDsr-PEI on the surface of nanofibers could be used as a responsive red fluorescence signal, while the QDsg dispersed in the nanofibers were used as a green background signal. Due to the high Cu2+ binding capacity of PEI and the contrast-color sensitivity of the two kinds of QDs, it realized an obvious fluorescence change from red to green toward Cu2+ in the liquid phase with a short response time of 30 s and a low detection limit of 2 mM by observation. Furthermore, the film exhibited excellent fluorescence stability to a high temperature and UV light, which is beneficial for satisfying much more possible applications. These results demonstrate that the dual fluorescent film sensor has a great potential for the real-time and visual detection of Cu2+.
关键词： dip-coating,fluorescent sensors,visual detection,Cu2+,quantum dots,electrospinning
更新于2025-09-16 10:30:52
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Fabrication of Polypropylene Nanofibers from Polypropylene/Polyvinyl Butyral Blend Films Using Laser‐Assisted Melt‐Electrospinning
摘要： Polypropylene (PP) nano?bers, a few hundred nanometers in diameter, are of immense importance in the ?ber industry. This article reports the fabrication of delicate PP nano?bers. Polyvinyl butyral (PVB) was added to PP as a blend component, and a nozzle-free melt-electrospinning system with a line-like CO2 laser melting device was used to manufacture PP nano?bers. We investigated the effect of PVB ratio on ?ber diameter. The addition of PVB was found to be potentially very bene?cial in PP/PVB blends, resulting in improved PP crystallinity and a steady decrease of ?ber diameter with high productivity. The reduction of ?ber diameter was attributed to the decline of viscosity, increase of surface adhesion properties, and polarity of blends due to the inclusion of PVB. To produce PP nano?ber, the PVB was removed from PP/PVB blend ?bers with an ethanol treatment. A drastic drop of PP ?ber diameter followed by ?ber splitting was observed after PVB removal. We obtained PP nano?bers with a diameter as low as 181 (cid:1) 105 nm from the blend ?ber with 90% PVB. Infrared spectroscopy of ?bers demonstrated that PP ?bers from pure polymer and blends showed the same characteristic peaks.
关键词： Polyvinyl butyral,ethanol treatment,Polypropylene,melt-electrospinning,CO2 laser,nano?bers
更新于2025-09-12 10:27:22
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The Effect of Time Deposition of PAN/TiO2 Electrospun on Photocurrent Performance of Dye-Sensitized Solar Cell
摘要： The development of effective photoanode materials with one-dimensional (1D) nanostructure provides promising scheme to fabricate efficient energy conversion device of DSSC. An innovation of PAN/TiO2 nanofibers was prepared by electrospinning method. In our work, the photoanode was produced with various time deposition of electrospinning to study their effecton the photocurrent of DSSC. Photodetector demonstrates the current of photogenerated charge carrier as well as a photo switch effect. These studies revealed that the photocurrent properties of DSSC depend on the photoanode thickness of PAN/TiO2 composite. Further, the system fabricated during 60 min deposition possessed the highest photocurrent performance.
关键词： deposition time,electrospinning,photocurrent,PAN/TiO2,DSSC
更新于2025-09-12 10:27:22
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Polyvinylpyrrolidone composite nanofibers as efficient substrates for surface-assisted laser desorption/ionization mass spectrometry
摘要： A matrix-free laser desorption/ionization mass spectrometry (LDI-MS) approach was developed using electrospun composite nanofibers with controllable size, morphology and composition. Composite polyvinylpyrrolidone (PVP) nanofibers with added nanoparticles to enhance the absorption of laser energy absorber were studied. Fractal dimensional analysis was conducted to evaluate the electrospinning process for the first time, which provided useful information on the repeatability of nanofiber production. The performance of the nanofiber-assisted laser desorption/ionization method was investigated through characterization of small drug molecules and synthetic oligomers. Homogeneous sample distribution was achieved by eliminating the “sweet spot”, resulting in good reproducibility. Mass spectra features clean background, that is especially beneficial for interpretation of small molecules. High sensitivity for small drug molecules and synthetic oligomers was obtained with limits of detection limits down to the low attomolar range. The combination of composite nanofibers with LDI-MS is a versatile and sensitive approach for detection and characterization of analytes with broad range of molecular weight.
关键词： Drug molecules,Surface-assisted laser desorption/ionization,Electrospinning,Synthetic polymers,polymeric nanofiber
更新于2025-09-12 10:27:22
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Lily (Iris Persica) pigments as new sensitizer and TiO2 nanofibers as photoanode electrode in Dye Sensitized Solar Cells
摘要： In this study, lily (Iris Persica) dyes as sensitizer were examined by UV-Vis and FTIR analyses. Corresponding results showed that lily pigments effectively absorb incident light. This was mainly due to the presence of functional groups such as C=O and O-H in the pigment structure appeared on the FTIR analysis. This shows the appropriateness of lily pigment as sensitizer. On the other hand, anatase TiO2 nanofibers with different diameters were synthesized by Electrospinning method, using Titanium isopropoxide (TIPP) and polyvinylpyrrolidone (PVP) solution. The Electrospinning feed rate was altered from 0.1 to 0.5 mL/h to control the diameter of the TiO2 nanofibers. Other effective parameters including voltage, needle tip distance to collector and speed of collector were 25 kV, 15 cm and 500 rpm, respectively and were kept constant during synthesizing of nanofibers. The Synthesized nanofibers were analyzed and characterized by means of SEM, FESEM, XRD and TEM techniques. The FESEM and XRD analyses indicated that the nanofiber's diameter and crystallinity increase with increase in feed rate. The fabricated DSSC with 430nm TiO2 nanofibers (obtained from flow rate of 0.3mL/h) provided 1.72% energy conversion efficiency (? ), 50.78% conversion efficiency of photon to electron (IPCE), short-circuit current density (JSC) of 2.716 mA/cm2 and open circuit voltage (VOC) of 0.738V. The efficiency of the developed DSSCs, in comparison with the previously fabricated similar cells, were found higher, due to more effective absorption of light by the dyes and adsorption of pigment by nanofibers.
关键词： TiO2 nanofibers,wild lily dyes,Dye sensitized solar cell (DSSC),electrospinning
更新于2025-09-12 10:27:22
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Low-temperature preparation of crystallized graphite nanofibers for high performance perovskite solar cells
摘要： Integration of two-dimensional graphite nanosheets into one-dimensional graphite nano?bers is essential for deep application of graphite materials. Here, we report preparation of crystallized graphite nano?bers by nozzle-less electrospinning and subsequent low-temperature heat treatment (500 °C). Depending on this graphitized one-dimensional nanostructure, we ?rst apply the graphite nano?bers as sca?old for perovskite solar cells (PSCs), which would provide a charge transfer highway in the light absorb layer and then improve the performance of devices. A high power conversion e?ciency of 18.23% was recorded for the graphite nano?bers based PSC with high ?ll factor of 76%.
关键词： Perovskite solar cell,Charge transfer,Electrospinning,Graphite nano?bers,Graphitization temperature
更新于2025-09-12 10:27:22
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Novel ultra-stable and highly luminescent white light-emitting diodes from perovskite quantum dots—Polymer nanofibers through biaxial electrospinning
摘要： Cesium lead halide perovskite quantum dots (QDs) have drawn extensive attention due to their excellent optical properties. However, their use is limited by poor stability. To enhance their stability, we electrospun perovskite-embedded fibers from composite CsPbX3 (X = Cl, Br, and I) perovskite QDs, blending with three polymers, poly(styrene-butadiene-styrene) (SBS), poly(methyl methacrylate) (PMMA), or polystyrene (PS), for the light-emitting diode (LED) applications. We found that the stretchable CsPbBr3@SBS fibers revealed the highest photoluminescence quantum yield, the CsPbBr3@PMMA fibers demonstrated a high thermal stability, and the CsPbBr3@PS fibers exhibited the best water-resistant stability. The photoluminescence intensity maintained 83% of its initial intensity for more than 3 months in water. Furthermore, the LED devices are manufactured from the blue chips and packaged with the core/shell red and green perovskite-based fibers by using biaxial electrospinning exhibited stable and highly efficient white luminescence. The luminance and efficiency are higher than 400% of the values of multilayered structures.
关键词： biaxial electrospinning,luminescence,stability,white light-emitting diodes,polymer nanofibers,perovskite quantum dots
更新于2025-09-11 14:15:04
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Preparation of TiO2 compact layer by heat treatment of electrospun TiO2 composite for dye-sensitized solar cells
摘要： The power conversion efficiency (PCE) of the dye-sensitized solar cell was improved by using titanium dioxide (TiO2) compact layer prepared via heat treatment assisted electrospinning. Titanium tetraisopropoxide mixed with polyvinyl-alcohol was used as the electrospun solution. In this study, TiO2 photoanode with TiO2 compact layer was compared with TiO2 photoanode without TiO2 compact layer where the PCE was improved by 76.88%. Electrochemical impedance spectroscopy proved that the TiO2 compact layer can reduce the series resistance and improved the short circuit current density, resulting in a low recombination effect that leads to a higher PCE. The electron lifetime and charge collection efficiency of TiO2 nanoparticles with TiO2 compact layer displayed a higher value compared to TiO2 nanoparticles without TiO2 compact layer.
关键词： titanium isopropoxide,polyvinyl alcohol,dye-sensitized solar cell,compact layer,electrospinning
更新于2025-09-11 14:15:04
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Electrospinning a Dye-Sensitized Solar Cell
摘要： Dye-sensitized solar cells (DSSCs) offer new possibilities to harvest solar energy by using non-toxic inexpensive materials. Since they can generally be produced on flexible substrates, several research groups investigated possibilities to integrate DSSCs in textile fabrics, either by coating full fabrics with the DSSC layer structure or by producing fiber-shaped DSSCs which were afterwards integrated into a textile fabric. Here we show a new approach, electrospinning all solid layers of the DSSC. We report on electrospinning the counter electrode with a graphite catalyst followed by a thin nonconductive barrier layer and preparing the front electrode by electrospinning semiconducting TiO2 from a polymer solution dyed with natural dyes. Both electrodes were coated with a conductive polymer before the system was finally filled with a fluid electrolyte. While the efficiency is lower than for glass-based cells, possible problems such as short-circuits—which often occur in fiber-based DSSCs—did not occur in this proof-of-concept. Since graphite particles did not fully cover the counter electrode in this first study, and the typical bathochromic shift indicating adsorption of dye molecules on the TiO2 layer was not observed, several ways are open to increase the efficiency in forthcoming studies.
关键词： electrospinning,environmentally friendly,graphite,nanofibers,natural dyes,dye-sensitized solar cell (DSSC)
更新于2025-09-11 14:15:04